Grinding machine



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. 5, 1944. M. N. BEREzNY GRINDING MACHINE Filed Oct. 29, 1943 3 Sheets-Sheet 2 INVENTOR. MIS CHA lV, EEREZA/y nagwaw Nh. QN

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. 5, 1944. M. N. BEREZNY GRINDING MACHINE 3 Sheets-Sheet 3 Filed Oct. 29, 1943 QM.. ....r

Il l' vw N. M C w M Patented Dec. 5, 1944 UNITED STATES FATENT OFFICE GRINDING MACHINE Mischa N. Berezny, San Francisco, Calif. Application ctober 29, 1943, Serial No. 508,127

, 7 Claims.

This invention relates to grinding machines and more particularly to grinding apparatus designed to work on flat annular surfaces and to reduce such to an even plane.

The main object of the invention is to provide a simple, compact, and portable mechanisin for grinding the contacting faces of annular flanges such as employed on steel pipe for connecting the sections thereof. It is essential that such faces be ground to an even plane to assure leakless` joints, particularlywhere high pressure steam is to be conveyed, and it has heretofore been the practice to grind down the faces of the pipe flanges by hand. The invention embodied in the mechanism hereinafter described .enables the grinding to be quickly and accurately accmomplished by a unit adapted tobe clamped directly to the pipe ange and to automatically effect the grinding operation when so connected and adjusted to .engage the work surface.

A preferred form` of the invention is more specifically described herein and is illustrated in the accompanying drawings where,

Figure l is a side elevation of the grinding unit with certain parts shown in section,

Figure 2 is a plan view thereof, and Figure 3 is an end elevation.

The unit is shown in connection with the end of a pipe lll having the circular end flange Il formed with the annular contacting face I2 which constitutes the surface to be ground.

The unit is designed to be clamped to and wholly supported by the pipe IIJ through clamping means engaging the peripheral edge of the` flange l l. Accordingly, the unit comprises opposed chuck heads I3 preferably shaped as shown in Figure 2, and formed with V-grooves at I4 for engagement with the flange edge. .Each chuck head la has a pair of upwardly and inwardly extended annular chuck arms l5 secured thereto with the respective inwardly extended portions of the arms on the opposite'heads in alignment and inwardly screw threaded. The ends of the opposite pairs of arms receive the screw threaded ends of adjusting screw shafts i6 which are journaled in opposite lateral projections I1 of the supporting frame or body of the grinder. ,The projections l1 are spaced to accommodate the nuts I8 on the screw shafts for turning same when mounting or dismounting the unit as it will be evident thatrotation of the shafts it will eifect movement of the chuck heads I3.

he driving and grinding elements are supported in a frame comprising the horizontal bed piece lil. with which the arms l1 are preferably integral, and the upright arched plate number 2li (Fig. 3). The bed piece I9 is open at the center to receive the cylindrical drive block 2| (Fig. 1). This drive block constitutes the tool carrying member of the machine and extends below the bed piece I9 where it is formed with male threads for connection with mating threads, at 22, in the inner portion of a horizontal grinder carrying arm 23. The drive block 2l is surrounded by a sleeve 24 rotatable von the block, and mounted between the annular flange 25 on the lower portion of the block 2l and the horizontal gear 26 secured to the upper face of the block as by bolts 21. The upper portion of block 2l is threaded as shown at 28 and is engaged by the adjusting ring 29 having complemental threads. Ring 29 is formed with an annular rack at 3B in mesh with a pinion 3l keyed to a shaft 32 mounted on the bed piece i9 and provided with a hand wheel 33. Actuation of shaft 32 will serve to rotate ring 29 with consequent adjustment of drive block 2| vertically to raise and lower the grinder carrying arm 23. The arm 23 is longitudinally slotted to slidably receive the grinder carriage 34. This carriage has a longitudinal threaded' bore through which passes the threaded shaft 35 rotatably mounted in the slot of arm 23 with its outer end extended a little beyond this arm and provided with a star shaped cam 36 the arms of which are positioned to engage a vertically adjustable trip 3l. rThe carriage 34 is formed with aligned depending lugs 38 in whichy the grinder roll drive shaft 39 is mounted for rotation. This shaft is angular in section, or splined, and a grinder roll 4U is slidably mounted on it between the lugs 38. At its inner end shaft 39 is rotatably supported in a bearing bracket 4l against longitudinal mpvement and has the bevel pinion 42 secured to its adjacent the bracket. Pinion l2 is in mesh with a' bevel pinion 113 on the lower end of a hollow vertical drive shaft 151i of angular cross section, which telescopes an upper section 44a directly driven by an electric motor l5 mounted on the arched member 2D. Shaft 44 .extends through a centralbore fili in drive block 2l and through bearing sleeves 4l', 43 which are rotatable in the bore. This arrangement permits the required vertical adjustment of the drive block and grinder arm and imparts rapid rotation to the grinder roll Ill).

To move the grinder roll in an orbital path over the flange face l2 at a low speed, the upper section 44a of the vertical drive shaft carries a drive gear i9 which rotates with the shaft and is vertically shiitable on it for a purpose to be described. The drive gear 49 is normally in mesh with a larger intermediate gear 50 journaled on a normally vertical shaft the lower end of which is pivotally supported at 5|'on the bed piece i9 and the upper end shiftably clamped in a slo-t in an arcuate laterally extending arm 5?.. on arched member 20, as =by a screw nut 53. Below gear 50 and rotatable with it as a unit is a gear sleeve 54 of small diameter and positioned to be nora mally in mesh with gear 2S of the drive block. The gear train just described obviously will impart a slow rotary movement to the block 2| and the grinder arm and roll it carries thus moving the rapidly rotating grinder roll slowly over the flange surface. provided to permit the vertical adjustment of the grinder mechanism heretofore referred to. At each revolution of the grinder arm, the star Wheel 36 will contact the trip 31 and the threaded shaft 35 be rotated approximately a quarter revolution, thus causing successive slight radial movements of the grinder roll.

To provide for a modified use of the grinder mechanism, as for instance grinding or lapping the inner surface or end of a pipe length, the drive gear Ml is provided with a shift collar 55 mounted in the fork of a shift lever 5B (Fig. 3) pivoted horizontally to one arm of the arched member 2i) at 5l and having a handle 58 on its free end beyond the opposite arm. Gear Z6, directly'below drive gear 139, is formed with a cen- The elongated gear sleeve 54 is y tral, internally toothed, opening 55 adapted to interlock with drivevgear 49. When gear 5D and sleeve 54 are moved out of mesh with gears 26 and 49 by tilting them, as shown in dotted line position in Fig. l, and gear 49 is shifted into interlocked position with gear 26, a direct drive will be imparted to the drive block 2l to rotate it at rapid rate. The screw thread connection between this block and the grinder arm at 22 allows the arm to be removed and some other grinding or lapping tool substituted.

The specific structure described is illustrative of the invention but is capable of variations without departure therefrom as hereinafter claimed.

I claim:

l. A portable grinder of the class described comprising a 'bed piece, opposite chuck heads mounted for radial clamping movement relatively to thebed piecein offset relation thereto and adapted to engage the edges of a pipe flange to position the bed piece in spaced relation to 'the ange face, a centrally located carrier head rotatable on the bed piece, a radial tool carrying arm extending from the carrier below the bed piece in fixed relation thereto, a grinder roll on said arm adapted to contact a flange face and means on the bed piece for'driving the grinder roll and for simultaneously rotating the carrier head to move the ygrinder roll in an orbital path.

2. A portable `grinder of the class desc-ribed comprising a bed piece, opposite chuck heads mounted for radial clamping movement relatively to the bed piece in offset relation thereto and adapted to engage the edges of a pipe flange to position the bed piece in spaced relation to the flange face, a centrally located radial toolI carrying arm extending from the carrier below the bed piece in fixed relation thereto, a grinder roll on said arm adapted to contact a flange face, means on the bed piece for adjusting the carrier head axially to and from the work, and means carried by the bed piece for driving the grinding roll and for simultaneously rotating the carrier head to move the grinder roll in an orbital path.

3. In a grinding machine, a rotatably mounted tool carrier and gear wheel rotatable as a unit and having an axial bore, a drive shaft located in said bore, means for rotating the drive shaft at constant speed, an axially shiftable drivepin ion splined on thedrive shaft adjacent the carcarrier head rotatable and axially adjustable on the bed piece, a

rier, a countershaft mounted adjacent the carrier and parallel to the drive shaft, intermediate reduction gears on the counter shaft normally in mesh with the drive gear and with the carrier gear wheel, and means for shifting the drive gear from engagement with the counter shaft gears and into interlocking engagement with the carrier.

4. In a grinding machine, a rotatably mounted tool carrier and gear Wheel rotatable as a unit and having an axial bore, a drive shaft located in said bore, means for rotating the drive shaft at constant speed, an axially shiftable drive pinion splined on the drive shaft adjacent the carrier, a laterally shiftable counter-shaft mounted adjacent the carrier and parallel to the drive shaft, intermediate reduction gears on the counter-shaft normally in mesh with the drive gear and with the carrier gear wheel, means for moving the counter-shaft from engagement with said bears by shifting same laterally and means for shifting the drive gear into interlocking engagement with the carrier.

5. In a grinding machine, a rotatably mounted tool carrier and gear wheel rotatable as a unit and having an axil bore, a drive shaft located in said bore, a grinder shaft on the carrier extending radially from the drive shaft and geared thereto, a grinding roll splined on the grinder shaft means for rotating the drive shaft at constant speed, an axially shiftable drive pinion splined on the drive shaft adjacent the carrier, a laterally shiftable counter-shaft mounted adjacent the carrier and parallel to the drive shaft, intermediate reduction gears on the counter-shaft normally in mesh with the drive gear and With the carrier gear wheel, means for moving the counter-shaft from engagement with said gears by shifting same laterally and means for imparting successive increments of movement to the grinding roll along its shaft.

6. In a grinding machine, a tool carrier and gear wheel mounted for rotation as a unit and having an axial bore, a drive shaft located in said bore and having a tool driving element on its end beyond the carrier, means for driving the shaft, a tool arm extending radially from the carrier adjacent the tool driving element, a grinding roll 'carried by said arm and rotatable with a shaft extending parallel to said arm and in direct driving relation with said element, and means actuated by the drive shaft for simultaneously rotating the carrier at reduced speed to move said roll in an orbital path.

'7. In a grinding machine, a tool carrier and gear wheel mounted for rotation as a unit and having an axial bore, a drive shaft located in said bore and having a tool driving element on its end beyond the carrier, means for driving the shaft, a tool arm extending radially from the carrier adjacent the tool driving element, a threaded shaft mounted on said arm parallel thereto, a tool carriage movable on the threads of said shaft, a grinding roll on said carriage and rotatable with a shaft extending parallel to said arm and in direct driving relation with said element, means actuated by the drive shaft for simultaneously rotating the carrier at reduced speed to move said roll in an orbital path, and tripping means in the path of said tool arm positioned to engage an actuating means on the threaded shaft to impart successive partial rotations thereto thereby moving the grinding roll step by step along its actuating shaft.

v y MISCHA N. BEREZNY. 

